I read on this site about an "E-Locker" option coming out for the Titan soon, and I'm wondering what it is. I'm guessing it's some kind of locking differential, but I'm not quite sure what it does. From what I understand, the locking differential locks the wheels together, so to speak, and makes them turn at the same rate. Is this right? And what are the advantages of that? And do the wheels normally turn at different rates? I thought the wheels always turn at the same rate.